zpool scrub - 4GB/s

Open Solaris 2009.06 + entry level 2U x86 server Sun Fire x4270 + 1U xxxx array.

# iostat -xnzCM 1|egrep "device|c[0123]$"
[...]
                 extended device statistics           
 r/s    w/s   Mr/s   Mw/s wait actv wsvc_t asvc_t  %w  %b device
8182.1    0.0 1022.1    0.0  0.1 152.8    0.0   18.7   0 1077 c0
8179.1    0.0 1021.7    0.0  0.1 148.7    0.0   18.2   0 1076 c1
8211.0    0.0 1025.9    0.0  0.1 162.8    0.0   19.8   0 1081 c2
8218.0    0.0 1026.8    0.0  0.1 164.5    0.0   20.0   0 1085 c3
                 extended device statistics           
 r/s    w/s   Mr/s   Mw/s wait actv wsvc_t asvc_t  %w  %b device
8080.2    0.0 1010.0    0.0  0.1 168.3    0.0   20.8   0 1070 c0
8080.2    0.0 1010.0    0.0  0.1 167.6    0.0   20.7   0 1071 c1
8165.2    0.0 1020.3    0.0  0.1 166.0    0.0   20.3   0 1079 c2
8157.2    0.0 1019.3    0.0  0.1 151.4    0.0   18.6   0 1080 c3
                 extended device statistics           
 r/s    w/s   Mr/s   Mw/s wait actv wsvc_t asvc_t  %w  %b device
8192.0    0.0 1023.4    0.0  0.1 174.6    0.0   21.3   0 1085 c0
8190.9    0.0 1023.1    0.0  0.1 174.2    0.0   21.3   0 1085 c1
8140.9    0.0 1016.9    0.0  0.1 145.5    0.0   17.9   0 1078 c2
8138.9    0.0 1016.7    0.0  0.1 142.7    0.0   17.5   0 1075 c3
                 extended device statistics           
 r/s    w/s   Mr/s   Mw/s wait actv wsvc_t asvc_t  %w  %b device
8129.1    0.0 1015.6    0.0  0.1 153.0    0.0   18.8   0 1066 c0
8125.2    0.0 1015.1    0.0  0.1 155.1    0.0   19.1   0 1067 c1
8156.2    0.0 1018.8    0.0  0.1 162.1    0.0   19.9   0 1074 c2
8159.2    0.0 1019.2    0.0  0.1 162.0    0.0   19.9   0 1076 c3
                 extended device statistics           
 r/s    w/s   Mr/s   Mw/s wait actv wsvc_t asvc_t  %w  %b device
8177.9    0.0 1022.0    0.0  0.1 165.0    0.0   20.2   0 1088 c0
8184.9    0.0 1022.9    0.0  0.1 165.2    0.0   20.2   0 1085 c1
8209.9    0.0 1026.1    0.0  0.1 162.4    0.0   19.8   0 1085 c2
8204.9    0.0 1025.5    0.0  0.1 161.8    0.0   19.7   0 1087 c3
                 extended device statistics           
 r/s    w/s   Mr/s   Mw/s wait actv wsvc_t asvc_t  %w  %b device
8236.4    0.0 1029.2    0.0  0.1 170.1    0.0   20.7   0 1092 c0
8235.4    0.0 1029.0    0.0  0.1 170.2    0.0   20.7   0 1093 c1
8215.4    0.0 1026.4    0.0  0.1 165.3    0.0   20.1   0 1091 c2
8220.4    0.0 1027.0    0.0  0.1 164.9    0.0   20.1   0 1090 c3


Then with a small I/O it can sustain over 400k IOPS - more HBAs should deliver even more performance.

It is really amazing how fast technology is progressing.
To achieve above numbers 10 years ago it would have cost a small fortune.